Campbell CS526 Instrukcja Obsługi Pobierz pdf (Strona 11)

CS526 ISFET pH Probe

instruction (see Section 8.2.2.2). Table 8-1 shows the “get data” command and

its response.

TABLE 8-1. Get Data Command and Response

Command Response

aMn!<CR>

Where:

a = probe address (factory

default is 1)

n = a single dummy character

(typically use 1)

a<value><CR><LF>

Where:

a = probe address (factory default is 1)

<value> = the probe’s reading for pH (in

millivolts).

8.2 CRBasic Programming

8.2.1 Instruction Sequence

A sequence of CRBasic instructions are used to measure the sensor. Table

8-2 shows the instruction sequence. Information about the instructions is

provided in Section 8.2.2 and an example program is provided in Section 8.2.3.

TABLE 8-2. Instruction Sequence

Instruction Function

SerialOpen()

Set up a datalogger port for serial communication (see

Section 8.2.2.1)

Scan()

Establish a scan rate

SerialOut()

Send “get data” command to the CS526.

See Section 8.1 and 8.2.2.2 for more information.

SerialIn()

Set up the COM port to receive the incoming serial data (see

Section 8.2.2.3).

Please note that in the beginning of the CRBasic program, the

variable used in the SerialIn instruction needs to be declared

as an ASCII string format.

SplitStr()

Split out numeric millivolt value for pH from the input string.

Probe output is “Counts”. A corrected multiplier and offset are

required to provide an output in pH units (see Appendix A).

NOTE

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

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Campbell CS526 Instrukcja Obsługi Strona 11